যদি x+3y=40 এবং y=3x হয় তবে, y=?
Solution
Correct Answer: Option D
দেওয়া আছে, x+3y=40
⇒ x+3 × 3x =40
⇒ x+ 9x=40
x=4
তাহলে,
y=3x=3 × 4 = 12
⇒ x+3 × 3x =40
⇒ x+ 9x=40
x=4
তাহলে,
y=3x=3 × 4 = 12
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